1999 SUBARU FORESTER Service Repair Manual

3G31 : CHECK FUSE.
Check fuse No. 18.
S6M0110A
:Is fuse No. 18 blown?
: Replace fuse No. 18. Go to step3G32.
: Go to step3G32.
3G32 : CHECK POWER SUPPLY.
1) Turn ignition switch to ON.
2) Measure voltage between fuse & relay box con-
nector and chassis ground.
Connector & terminal
(B152) No. 5 (+) Ð Chassis ground (þ):
:Is voltage more than 10 V?
: Go to step3G33.
: Replace fuse No. 18. When fuse No. 18
is blown again, repair shorted parts of
circuit.3G33 : CHECK CRUISE CONTROL MAIN
SWITCH.
1) Turn ignition switch to OFF.
2) Remove cruise control main switch and discon-
nect connector.
3) Turn ignition switch to ON.
4) Measure voltage between cruise control main
switch connector and chassis ground.
Connector & terminal
(B161) No. 3 (+) Ð Chassis ground (þ):
B6M0183C
:Is voltage more than 10 V?
: Go to step3G34.
: Replace cruise control main switch.

3G34 : CHECK CRUISE CONTROL MAIN
SWITCH.
Measure resistance between cruise control main
switch terminals.
Terminals
No. 3 Ð No. 5:
G6M0244
:Is resistance less than 10W? (When
switch is ON.)
: Go to step3G35.
: Replace cruise control main switch.

27
[T3G3]6-2DIAGNOSTICS
3. Cruise Control System

3G35 : CHECK CRUISE CONTROL MAIN
SWITCH.
Measure resistance between cruise control main
switch terminals.
Terminals
No. 3 Ð No. 5:
G6M0244
:Is resistance less than 1 MW? (When
switch is OFF.)
: Go to step3G36.
: Replace cruise control main switch.

3G36 : CHECK HARNESS BETWEEN
CRUISE CONTROL MAIN SWITCH
CONNECTOR AND CHASSIS
GROUND.
1) Connect connector.
2) Turn ignition switch to ON.
3) Turn cruise control main switch to ON.
4) Measure voltage between terminal of cruise
control main switch and chassis ground.
Connector & terminal
(B161) No. 3 (+) Ð Chassis ground (þ):
S6M0111A
:Is voltage more than 10 V?
: Go to step3G37.
: Repair or replace wiring harness.3G37 : CHECK HARNESS BETWEEN
CRUISE CONTROL MAIN SWITCH
CONNECTOR AND CHASSIS
GROUND.
Measure voltage between terminal of cruise con-
trol main switch chassis ground.
Connector & terminal
(B161) No. 5 (+) Ð Chassis ground (þ):
S6M0111A
:Is voltage more than 10 V?
: Go to step3G38.
: Repair or replace wiring harness.
3G38 : CHECK HARNESS BETWEEN
CRUISE CONTROL MODULE CON-
NECTOR AND CHASSIS GROUND.
Measure voltage between terminal of cruise con-
trol module and chassis ground.
Connector & terminal
(B94) No. 4 (+) Ð Chassis ground (þ):
S6M0111A
:Is voltage more than 10 V?
: Replace cruise control module. 6-2 [W12B4].>
: Repair or replace wiring harness.
NOTE:
Depress cruise control main switch with fingers
while measuring voltage between (B161) No. 5
and chassis ground.
28
6-2[T3G3]DIAGNOSTICS
3. Cruise Control System

H: DIAGNOSTICS CHART WITH DIAGNOSTIC CODE
1. DIAGNOSTIC CODE LIST
Diagnostic
codeItem Contents of diagnosis Index No.
11 BRAKE SW/STOP SW Input signals from brake switch ªOFFº, stop light
switch ªONº
(Brake pedal is depressed.)
12 CLUTCH SW/INHIBITOR SW Input signals from clutch switch ªOFFº (MT), or inhibi-
tor switch ªP or Nº (AT)
[Clutch pedal is depressed (MT), or select lever is set
to P or N position (AT).]
13 LOW SPEED LIMIT Low-speed control limiter
14 CANCEL SW Input signal from cancel switch
(faulty SET/COAST switch or RESUME/ACCEL
switch)
21 VACUUM VALVE Faulty vacuum valve or valve drive system
22 VENT 2 VALVE Faulty vent 2 valve or valve drive system
23 VENT 1 VALVE Faulty vent 1 valve or valve drive system
24 SPEED SENSOR Faulty vehicle speed sensor (MT) or transmission
control module (AT)
25 CONTROL MODULE Faulty CPU RAM included in cruise control module
29
[T3H1]6-2DIAGNOSTICS
3. Cruise Control System

2. DIAGNOSTIC CODE 11 (BRAKE SWITCH, STOP LIGHT SWITCH)
DIAGNOSIS:
IFailure or disconnection of the stop light switch and brake switch.
TROUBLE SYMPTOM:
ICruise control cannot be set.
WIRING DIAGRAM:
S6M0112
30
6-2[T3H2]DIAGNOSTICS
3. Cruise Control System

3H21 : CHECK BRAKE SWITCH.
1) Turn ignition switch to ON.
2) Turn cruise control main switch to ON.
3) Apply parking brake securely.
4) Set select monitor in ªCurrent Data Display &
Saveº mode.
5) Depress the brake pedal and check signals for
proper operation.
(1) The Stop Light Switch shown on the display
turns from ªOFFº to ªONº.
(2) The Brake Switch shown on the display
turns from ªOFFº to ªONº.
6) Release the brake pedal.
7) Remove connector of stop and brake switch.
8) Check circuit between brake switch terminal.
Terminals
No. 1 Ð No. 4: (Brake switch)
G6M0183
:Is resistance less than 1W? (When
brake pedal is released.)
: Go to step3H22.
: Replace brake and stop light switch.
3H22 : CHECK BRAKE SWITCH.
Check circuit between brake switch terminal.
Terminals
No. 1 Ð No. 4: (Brake switch)
G6M0183
:Is resistance more than 1 MW? (When
brake pedal is depressed.)
: Go to step3H23.
: Replace brake and stop light switch.

3H23 : CHECK STOP LIGHT SWITCH.
Check circuit between stop light switch terminal.
Terminals
No. 2 Ð No. 3: (Stop light switch)
G6M0183
:Is resistance more than 1 MW? (When
brake pedal is released.)
: Go to step3H24.
: Replace brake and stop light switch.

31
[T3H2]6-2DIAGNOSTICS
3. Cruise Control System

3H24 : CHECK STOP LIGHT SWITCH.
Check circuit between stop light switch terminal.
Terminals
No. 2 Ð No. 3: (Stop light switch)
G6M0183
:Is resistance less than 1W? (When
brake pedal is depressed.)
: Replace cruise control module. 6-2 [W12B4].>
: Replace brake and stop light switch.

32
6-2[T3H2]DIAGNOSTICS
3. Cruise Control System

MEMO:
33
[T3H2]6-2DIAGNOSTICS
3. Cruise Control System

3. DIAGNOSTIC CODE 12 (CLUTCH SWITCH, INHIBITOR SWITCH)
DIAGNOSIS:
IFailure or disconnection of the clutch switch. (MT)
IFailure or disconnection of the inhibitor switch. (AT)
TROUBLE SYMPTOM:
ICruise control cannot be set.
WIRING DIAGRAM:
S6M0384
34
6-2[T3H3]DIAGNOSTICS
3. Cruise Control System